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The aim of the study was to compare the share of hatchery-reared lake trout Salmo truttam.lacustrisin catches of fingerlings in the upper Wda and the Pilica Rivers in Autumn, following the stocking fish in spring 2005. Larvae in number of 40 thousand had been previously exposed to the thermal shock procedure (temperature decrease from 8.0 to 2.5oC for 2 hours, and back to initialvalue), then released...
A study was carried out in a shallow, eutrophic Oświn Lake, within Seven Islands Reserve (north-eastern Poland), in order to determine the infection of fish with monogeneans as sensitive indicators of water quality. This paper presents comparative analysis of the occurrence of Monogenea in fishes from two, distinctly separated pools of the lake, differing in environmental conditions. The impact of...
Background. Aparasitological survey was carried out in a shallow, eutrophic Oświn Lake (north-eastern Poland), within the Seven Islands ornithological reserve. We intended to compare the occurrence of eyeflukes in fish from two, distinctly demarcated pools of the lake, differing in environmental conditions. The effect of fish size and sampling season on the infection parameters was analysed and the...
Background. The study was carried out in the shallow, eutrophic Oświn Lake, in the area of the Seven Islands ornithological reserve (north-eastern Poland) to determine the infection of fish with digeneans maturing in piscivorous birds. This paper presents a comparative analysis of the occurrence of Posthodiplostomum cuticola in fish from two parts of the reservoir differing in environmental conditions...
The presence of bacteria and parasites on the gills of pike and tench from Oświn Lake in the Seven Islands Reserve was investigated. Parallel bacteriological analyses of the water were done. The materials were sampled in May-June, July, October 1999, six years after the water level had been increased. The bacteriological and parasitological results both indicate that this body of water is eutrophic...
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